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I think that this is a good question.
While I am no eyepiece expert, since no one else has posted a response yet, I'll try...
There are a couple of potential causes of ghost images that I am aware of…
#1 internal reflections within the eyepiece
#2 counter reflection off of your cornea on to the nearest lens surface to your eye
There may be more causes...based on your comments about the importance of eye placement I'd suspect #2...
Cheers,
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